Before I use Unity5.6.3 version and ModelTarget7.6.12 release project, has been published to the mobile end run before is no problem, just yesterday I opened the camera picture is the black screen, I didn't do any changes.I again put ModelTarget Unity plugin guide into the new project, or use before LicenseKey, published to the mobile terminal device running on the tip of the graphic below error, camera still can't open, but there is no any problem on the PC.What's the reason?

Thanks!